This is a poem by:Edgar Allen Poe (I think)
Once upon a midnight dreary,
While I pondered,
Weak and weary,
Over many a quaint and curious volume of forgotten lore--
While I nodded,
Nearly napping,
Suddenly there came a tapping,
As of some one gently rapping,
Rapping at my chamber door.
"Tis some visitor," I muttered, "tapping at my chamber door"
Only this and nothing more."
encased encaptured enclosed in my lil` shell .